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Article Dans Une Revue Physical Review Applied Année : 2023

Equireflectionality and customized unbalanced coherent perfect absorption in asymmetric waveguide networks

Malte Röntgen
  • Fonction : Auteur
Olivier Richoux
  • Fonction : Auteur
Georgios Theocharis
  • Fonction : Auteur
Christian V Morfonios
  • Fonction : Auteur
Peter Schmelcher
  • Fonction : Auteur
Vassos Achilleos
  • Fonction : Auteur

Résumé

We explore the scattering of waves in designed asymmetric one-dimensional waveguide networks. We show that the reflection between two ports of an asymmetric network can be identical over a broad frequency range, as if the network was mirror-symmetric, under the condition of so-called latent symmetry between the ports. This broadband equireflectionality is validated numerically for acoustic waveguides and experimentally through measurements on microwave transmission-line networks. In addition, introducing a generalization of latent symmetry, we study the properties of an N-port scattering matrix S. When the powers of S fulfill certain relations, which we coin scaled cospectrality, the setup is guaranteed to possess at least one zero eigenvalue of S, so that the setup features coherent perfect absorption. More importantly, scaled cospectrality introduces a scaling factor which controls the asymmetry of the incoming wave to be absorbed. Our findings introduce a novel approach for designing tunable wave manipulation devices in asymmetric setups. As evidenced by our acoustic simulations and microwave experiments, the generality of our approach extends its potential applications to a wide range of physical systems.
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hal-04297378 , version 1 (21-11-2023)

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Malte Röntgen, Olivier Richoux, Georgios Theocharis, Christian V Morfonios, Peter Schmelcher, et al.. Equireflectionality and customized unbalanced coherent perfect absorption in asymmetric waveguide networks. Physical Review Applied, 2023, 20 (4), pp.044082. ⟨10.1103/PhysRevApplied.20.044082⟩. ⟨hal-04297378⟩
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